<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<script type="text/javascript">
			//引用数据类型保存过去的是存放值的地址
			Object.prototype.n = 10;
			
			function F() {
			    this.n = 11;
			}
			F.prototype.n = 12;
			//还未实例化
			console.log(F.n); //10
			//实例化一个对象f1
			let f1 = new F();
			console.log(f1.n); //11
		</script>
	</body>
</html>
